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Infrared Chalcogenide Glass

Infrared Chalcogenide GlassInfrared Glasses (IG) offer excellent transmission in very wide spectral range covering NIR, MWIR and LWIR. Physical properties such as low dn/dT and low dispersion enable optical designers to engineer color-correcting optical systems without thermal defocusing. Our IR glass is an ideal material for both high performance infrared imaging systems as well as high volume commercial applications. It offers lower and more stable pricing than Germanium. It can be finished with traditional manufacturing technologies, or be molded directly into a finished optic offering a very cost-competitive solution. We have two standard Infrared Glasses- IG111 and IG131.  And we can develop various composition of new infrared glass as your specific requirements.


Bluebean Optical's IR Glass Product Features:

- Low dn/dT and low dispersion

- Excellent transmission in SWIR, MWIR & LWIR

- Customized coatings

- Effective production from prototypes to mass volumes


Infrared Chalcogenide Glass Properties:


 IG111

 IG131

 Composition(mol%)

 Ge20Sb15Se65

 Ge28Sb12Se60

 Transmittance

 1.0-13.0um

 1.0-13.0um

 Temperature coeff of refractive index, dn/dt@298K

 5.8 x10-5/K@10.6um

 8.7 x10-5/K @10.6um

 Thermal expansion coefficient(293-473K)

 15.5 x 10-6/K

 15.0 x 10-6/K

 Thermal conductivity

 0.23 W/m.k

 0.50 W/m.k

 Transition temperature

 558K

 573K

 Thermal birefringent index coefficient(298K)

 5.8 x 10-5/K

 8.7 x 10-5/K

 Specific heat

 0.34 J/g.K

 0.56 J/g.K

 Density

 4.72 g/cm3

 4.67 g/cm3

 Young's modulus

 19.11 Gpa

 29.60 Gpa

 Torsion modulus

 7.52 Gpa

 18.00 Gpa

 Poisson’s ratio

 0.27

 0.26

 

Transmission of Infrared Glass IG111 with a thickness of 3 mm:

 

Infrared Glass(IG111) Transmission

 

Optical Refractive Index n & Transmission (293K):

 

λ (um)

Refractive Index

Transmission

IG111

IG131

IG111

IG131

2.0

2.6261

-

65.4%

-

3.0

2.6116

2.6273

65.6%

66.9%

4.0

2.6058

2.6224

66.2%

66.7%

5.0

2.6022

2.6183

66.9%

66.4%

6.0

2.5991

2.6157

67.4%

66.5%

7.0

2.5962

2.6130

67.8%

66.1%

8.0

2.5929

2.6099

67.7%

66.8%

9.0

2.5895

2.6064

66.2%

66.7%

10

2.5858

2.6026

67.6%

66.9%

11

2.5816

2.5985

67.4%

66.5%

12

2.5769

2.5948

67.8%

51.3%

 

Typical Fabrication Specifications:

 

 Material

 Chalcogenide Glass

 Clear Aperture

 90%

 Diameter

 3.0-50mm, ±0.015mm

 Center Thickness

 ±0.02mm

 Decentration

 ±0.005mm

 Aspheric form(PV)

 0.5um

 Surface Quality

 80/60

 Wedge

 5 arc minutes

 

* Higher tolerances and AR coatings are available upon request.